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Finding the Fourth Proportional to 511.85, 767.72 and 439.22

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Solution

The fourth proportional to 511.85, 767.72 and 439.22 is: 658.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.85 : 767.72 = 439.22 : x
  2. Step 2: Convert to fraction form
    511.85/767.72 = 439.22/x
  3. Step 3: Cross multiply
    511.85x = 767.72 × 439.22
  4. Step 4: Simplify right side
    511.85x = 337,191.94
  5. Step 5: Solve for x
    x = 337,191.94/511.85
  6. Step 6: Final answer
    x = 658.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.